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I am replacing a failed SPICA pump with one that is "known good" from my spare engine. The problem is, the sealing cone is missing from the pump gap reference screw on this one, and it looks tampered with.http://www.alfabb.com/bb/forums/images/AlfaBB_2015/smilies/tango_face_crying.png My sealed screw

Some have given nominal protrusions by thread count, which is very useful, but since I have trouble defining the start of the thread, I found it easier to measure this in distance units. My sealed screw protrudes 0.110" (about 2.5 threads). The molested one protrudes about 0.088".

The question is, if your car has its original reference screw setting for the pump gap, as evidenced by still having the plastic cone over it, what is the protrusion of your reference screw in inches (or mm) past the metal lug it goes through?

My thinking is that we can build some statistics to see how close these were set at the factory. http://www.alfabb.com/bb/forums/images/AlfaBB_2015/smilies/tango_face_glasses.pngIf they were all within a few thousandths of 0.110", for example, we'd know we could use that for a nominal setting.

The measurement is a bit tricky, but I felt I could do a pretty good job with the depth-guage on a caliper.

Thanks,
Larry - Pasadena

63 Giulietta (weekend driver)
65 Giulia (rusty donor)
75 sedan (daily driver)
76 sedan
87 Milano (DNR)
 

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Three that I have measure at .118 to .122"

Given internal wear by now on 3D cams and cam followers, I doubt that getting to within 1/1000th of an inch makes much difference.
 

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This might not be a valid datapoint since it's from a rebuilt pump, but the reference screw on the pump I just got back from Wes measures about .077". No doubt the internal modifications that Wes makes changes the zero point.
 
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